Yanqin Jin 002b30c967 Fix clang analyzer (#7518)
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/7518

Test Plan:
```
$USE_CLANG=1 make analyze
```

Reviewed By: zhichao-cao

Differential Revision: D24175390

Pulled By: riversand963

fbshipit-source-id: c70121652908cf5d450120c38ab65cc595332ca7
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